d$_{xz/yz}$ subband structure and Chiral Orbital Angular Momentum of Nb doped SrTiO$_{3}$ surface states

ORAL

Abstract

Using angle resolved photoemission spectroscopy (ARPES), we investigate subband structure and chiral orbital angular momentum (OAM) texture on the surface of lightly electron doped SrTiO$_{3}$ single crystals. Our linearly polarized light ARPES data taken with 51 eV photons, reveal additional subbands for out-of-plane d$_{xz/yz\, }$orbitals in addition to the previously reported ones. Our CD-ARPES data reveal a chiral OAM structure which we use as a clue to explain the origin of linear Rashba-like surface band splitting of Ti 3d t$_{2g}$ orbitals. The observed CD signal is enhanced near crossing points, where different orbitals hybridize, compatible with a linear Rashba-like surface band splitting.

*The work was supported by IBS-R009-G2. S.S., S.C., H.Y. and G. H. acknowledge were supported by Yonsei university, BK21 program.

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Authors

  • Shoresh Soltani

    • Physics Department, Yonsei University, Seoul 120-749, Korea & Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea

  • Soohyun Cho

    • Physics Department, Yonsei University, Seoul 120-749, Korea & Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea
    • Yonsei University, ibs-cces

  • Hanyoung Yoo

    • Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea
    • Department of Physics and Astronomy, Seoul National University

  • Garam Han

    • Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea

  • Timur Kim

    • Diamond Light Source, Harwell Science and Innovation Campus, United Kingdom
    • Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom

  • Moritz Hoesch

    • Diamond Light Source, Harwell Science and Innovation Campus, United Kingdom
    • Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom

  • Changyoung Kim

    • Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea & Department of Physics and Astronomy, SNU, Seoul, Korea